DTC P0516-769: Battery Temperature Sensor Circuit Low; DTC P0517-770: Battery Temperature Sensor Circuit High: Procedure

1. Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors.
   Fig 1: Identifying Power Management Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact pressure problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / EV / Data List / Auxiliary Battery Temperature.
4. Read the Data List.

   Result

   Result	Proceed to
   -40°C (-40°F)	A
   215°C (419°F)	B
   Same as actual temperature	C

5. Turn the power switch off.

B → See step   5 

C → See step   8 

A: Go to next step 

1. Disconnect the thermistor assembly connector.
   Fig 2: Identifying Thermistor Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals 2 and 1 of vehicle side connector of the thermistor assembly.
3. Connect the Techstream to the DLC3.
4. Turn the power switch on (IG).
5. Enter the following menus: Powertrain / EV / Data List / Auxiliary Battery Temperature.
6. Read the Data List.
   Fig 3: Identifying Thermistor Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Techstream Display	Switch Condition	Specified Condition
   Auxiliary Battery Temperature	Terminals 1 and 2 connected. Power switch on (IG)	215°C (419°F)

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Thermistor Assembly)

7. Turn the power switch off.
8. Reconnect the thermistor assembly connector.

NG → See step   4 

OK → REPLACE THERMISTOR ASSEMBLY 

1. Connect terminals 16 (THB) and 18 (ETHB) of connector of the power management control ECU.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Enter the following menus: Powertrain / EV / Data List / Auxiliary Battery Temperature.
5. Read the Data List.
   Fig 4: Identifying Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Techstream Display	Switch Condition	Specified Condition
   Auxiliary Battery Temperature	Terminals THB and ETHB connected. Power switch on (IG)	215°C (419°F)

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

6. Turn the power switch off.

NG → See step   7 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the thermistor assembly connector.
   Fig 5: Identifying Thermistor Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Enter the following menus: Powertrain / EV / Data List / Auxiliary Battery Temperature.
5. Read the Data List.

   Result

   Techstream Display	Switch Condition	Specified Condition
   Auxiliary Battery Temperature	Power switch on (IG)	-40°C (-40°F)

6. Turn the power switch off.
7. Reconnect the thermistor assembly connector.

NG → See step   6 

OK → REPLACE THERMISTOR ASSEMBLY 

1. Disconnect the thermistor assembly connector.
2. Disconnect the power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 6: Measuring Resistance Of Thermistor Assembly - Power Management Control ECU Harness & Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   C22-16 (THB) - A35-2	Power switch off	Below 1 Ω
   C22-18 (ETHB) - A35-1	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   C22-16 (THB) or A35-2 - Body ground and other terminals	Power switch off	10 kΩ or higher
   C22-18 (ETHB) or A35-1 - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Thermistor Assembly)
   *b	Rear view of wire harness connector (to Power Management Control ECU)

4. Reconnect the thermistor assembly connector.
5. Reconnect the power management control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

NEXT → See step   9